Second monitor on laptop

Hi!
I have a Lenovo Thinkpad X1 Extreme freshly setup with Endeavouros. I am struggling to get my secondary monitor to display anything. It worked fine using the live-USB, just before installation. Could you please help me to troubleshoot this? I provide information below that I found in posts troubleshooting similar issues.

Thanks so much for helping!

inxi -Gxxxa
Graphics:
  Device-1: NVIDIA TU117M [GeForce GTX 1650 Mobile / Max-Q] vendor: Lenovo
    driver: nvidia v: 550.90.07 alternate: nouveau,nvidia_drm non-free: 550.xx+
    status: current (as of 2024-06; EOL~2026-12-xx) arch: Turing code: TUxxx
    process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
    lanes: 16 link-max: gen: 3 speed: 8 GT/s ports: active: none
    off: DP-3,eDP-1 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 01:00.0
    chip-ID: 10de:1f91 class-ID: 0300
  Device-2: Microsoft Microsoft LifeCam Studio
    driver: hid-generic,snd-usb-audio,usbhid,uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-4.2.1:9 chip-ID: 045e:0811
    class-ID: 0300
  Device-3: Chicony Integrated Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-8:3 chip-ID: 04f2:b67c
    class-ID: 0e02 serial: 6926
  Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.0
    compositor: xfwm4 v: 4.18.0 driver: X: loaded: nvidia unloaded: modesetting
    alternate: fbdev,nouveau,nv,vesa gpu: nvidia,nvidia-nvswitch
    display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x286mm (20.00x11.26")
    s-diag: 583mm (22.95")
  Monitor-1: not-matched mapped: DP-1.1 size-res: N/A modes: N/A
  Monitor-2: not-matched mapped: DP-2 pos: primary res: 1920x1080 hz: 60
    dpi: 142 size: 344x194mm (13.54x7.64") diag: 395mm (15.55") modes: N/A
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
    drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia x11: drv: nvidia
    inactive: wayland,device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.90.07
    glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce GTX 1650/PCIe/SSE2
    memory: 3.91 GiB
dkms status
nvidia/550.90.07, 6.9.6-arch1-1, x86_64: installed
nvidia-installer-check
bash: nvidia-installer-check: command not found
 nvidia-inst --prime
2024-06-24 13:48:40: Info: Running: nvidia-inst v24-1
2024-06-24 13:48:40: Info: Command line: nvidia-inst --prime
2024-06-24 13:48:40: Info: Selected mode: prime
NVIDIA card id: 1f91
Fetching driver data from nvidia.com ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMMANDS TO RUN:
    ==> Looks like all requested packages and settings are already OK!
nxi -zv8
System:
  Kernel: 6.9.6-arch1-1 arch: x86_64 bits: 64 compiler: gcc v: 14.1.1
    clocksource: tsc avail: acpi_pm
    parameters: initrd=\656ba89f69a34227aed601eeb919e5a9\6.9.6-arch1-1\initrd
    nvidia-drm.modeset=1 nvme_load=YES nowatchdog rw
    root=UUID=a5b166f8-8a1c-486d-98fc-0f7ffe120c22 nvidia_drm.modeset=1
    systemd.machine_id=656ba89f69a34227aed601eeb919e5a9
  Desktop: Xfce v: 4.18.1 tk: Gtk v: 3.24.36 wm: xfwm4 v: 4.18.0
    with: xfce4-panel tools: xfce4-screensaver vt: 1 dm: 1: GDM v: 46.2
    note: stopped 2: LightDM v: 1.32.0 note: stopped 3: LXDM note: stopped
    Distro: EndeavourOS base: Arch Linux
Machine:
  Type: Laptop System: LENOVO product: 20QWS0E400 v: ThinkPad X1 Extreme 2nd
    serial: <superuser required> Chassis: type: 10 serial: <superuser required>
  Mobo: LENOVO model: 20QWS0E400 v: SDK0J40697 WIN
    serial: <superuser required> part-nu: LENOVO_MT_20QW_BU_Think_FM_ThinkPad
    X1 Extreme 2nd uuid: <superuser required> UEFI: LENOVO v: N2OET63W (1.50 )
    date: 03/13/2024
Battery:
  ID-1: BAT0 charge: 48.1 Wh (66.9%) condition: 71.9/80.4 Wh (89.4%)
    power: 15.4 W volts: 16.4 min: 15.4 model: Celxpert 5B10V98091 type: Li-poly
    serial: <filter> status: charging cycles: 326
Memory:
  System RAM: total: 32 GiB available: 31.03 GiB used: 1.95 GiB (6.3%)
  Message: For most reliable report, use superuser + dmidecode.
  Array-1: capacity: 64 GiB slots: 2 modules: 1 EC: None
    max-module-size: 32 GiB note: est.
  Device-1: ChannelA-DIMM0 type: DDR4 detail: synchronous size: 32 GiB
    speed: 2667 MT/s volts: curr: 1 width (bits): data: 64 total: 64
    manufacturer: Samsung part-no: M471A4G43MB1-CTD serial: <filter>
  Device-2: ChannelB-DIMM0 type: no module installed
PCI Slots:
  Permissions: Unable to run dmidecode. Root privileges required.
CPU:
  Info: model: Intel Core i7-9850H bits: 64 type: MT MCP arch: Coffee Lake
    gen: core 9 level: v3 note: check built: 2018 process: Intel 14nm family: 6
    model-id: 0x9E (158) stepping: 0xD (13) microcode: 0xFC
  Topology: cpus: 1x cores: 6 tpc: 2 threads: 12 smt: enabled cache:
    L1: 384 KiB desc: d-6x32 KiB; i-6x32 KiB L2: 1.5 MiB desc: 6x256 KiB
    L3: 12 MiB desc: 1x12 MiB
  Speed (MHz): avg: 800 min/max: 800/4600 scaling: driver: intel_pstate
    governor: powersave cores: 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800
    8: 800 9: 800 10: 800 11: 800 12: 800 bogomips: 62431
  Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat
    arch_capabilities arch_perfmon art avx avx2 bmi1 bmi2 bts clflush
    clflushopt cmov constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64
    dtherm dts epb ept ept_ad erms est f16c flexpriority flush_l1d fma fpu
    fsgsbase fxsr ht hwp hwp_act_window hwp_epp hwp_notify ibpb ibrs
    ibrs_enhanced ida intel_pt invpcid lahf_lm lm mca mce md_clear mmx
    monitor movbe mpx msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq
    pdcm pdpe1gb pebs pge pln pni popcnt pse pse36 pts rdrand rdseed rdtscp
    rep_good sdbg sep sgx sgx_lc smap smep smx ss ssbd sse sse2 sse4_1 sse4_2
    ssse3 stibp syscall tm tm2 tpr_shadow tsc tsc_adjust tsc_deadline_timer
    vme vmx vnmi vpid x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology
    xtpr
  Vulnerabilities:
  Type: gather_data_sampling mitigation: Microcode
  Type: itlb_multihit status: KVM: VMX disabled
  Type: l1tf status: Not affected
  Type: mds status: Not affected
  Type: meltdown status: Not affected
  Type: mmio_stale_data mitigation: Clear CPU buffers; SMT vulnerable
  Type: reg_file_data_sampling status: Not affected
  Type: retbleed mitigation: Enhanced IBRS
  Type: spec_rstack_overflow status: Not affected
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
    prctl
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: Enhanced / Automatic IBRS; IBPB:
    conditional; RSB filling; PBRSB-eIBRS: SW sequence; BHI: SW loop, KVM: SW
    loop
  Type: srbds mitigation: Microcode
  Type: tsx_async_abort mitigation: TSX disabled
Graphics:
  Device-1: NVIDIA TU117M [GeForce GTX 1650 Mobile / Max-Q] vendor: Lenovo
    driver: nvidia v: 550.90.07 alternate: nouveau,nvidia_drm non-free: 550.xx+
    status: current (as of 2024-06; EOL~2026-12-xx) arch: Turing code: TUxxx
    process: TSMC 12nm FF built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s
    lanes: 16 link-max: gen: 3 speed: 8 GT/s ports: active: none
    off: DP-3,eDP-1 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 01:00.0
    chip-ID: 10de:1f91 class-ID: 0300
  Device-2: Microsoft Microsoft LifeCam Studio
    driver: hid-generic,snd-usb-audio,usbhid,uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-4.2.1:9 chip-ID: 045e:0811
    class-ID: 0300
  Device-3: Chicony Integrated Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-8:3 chip-ID: 04f2:b67c
    class-ID: 0e02 serial: <filter>
  Display: x11 server: X.Org v: 21.1.13 with: Xwayland v: 24.1.0
    compositor: xfwm4 v: 4.18.0 driver: X: loaded: nvidia unloaded: modesetting
    alternate: fbdev,nouveau,nv,vesa gpu: nvidia,nvidia-nvswitch
    display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x286mm (20.00x11.26")
    s-diag: 583mm (22.95")
  Monitor-1: not-matched mapped: DP-1.1 size-res: N/A modes: N/A
  Monitor-2: not-matched mapped: DP-2 pos: primary res: 1920x1080 hz: 60
    dpi: 142 size: 344x194mm (13.54x7.64") diag: 395mm (15.55") modes: N/A
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
    drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia x11: drv: nvidia
    inactive: wayland,device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.90.07
    glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce GTX 1650/PCIe/SSE2
    memory: 3.91 GiB
Audio:
...

I ended up installing Endeavouros once again, choosing kde plasma. Works like a charm!